Update docbook doctype declaration.

doc/en/index.docbook

@@ -1,12 +1,10 @@
 <?xml version="1.0" ?>
-<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.1.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
+<!DOCTYPE book PUBLIC "-//KDE//DTD DocBook XML V4.2-Based Variant V1.1//EN" "dtd/kdex.dtd" [
   <!ENTITY tdeio_sword "<application>Kio-Sword</application>">
   <!ENTITY kappname "&tdeio_sword;"><!-- Do *not* replace kappname-->
   <!ENTITY package "kde-module"><!-- tdebase, tdeadmin, etc -->
   <!ENTITY % addindex "IGNORE">
   <!ENTITY % English "INCLUDE"><!-- change language only here -->
-  
-  
 ]>
 
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